function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
    var expires = "expires=" + d.toGMTString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
}

function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i].trim();
        if (c.indexOf(name) == 0) { return c.substring(name.length, c.length); }
    }
    return "";
}

function deleteCokkie(cname) {
    document.cookie = `${cname}=; expires=Thu, 01 Jan 1970 00:00:00 GMT`;
}

//看用户是否登录
function checkLoginName() {
    var user = getCookie("username");
    return user;
}


function loginOut() {
    $.ajax({
        type: 'get',
        url: '/user/logout',
        dataType: 'json',
        success: function(data) {
            deleteCokkie("username");
            location.reload();

        }
    });

}